ash: command not found

Question

On my NAS I have installed Unison package, which works when ssh'd into the NAS with this $NAS unison -version.

However when running the command locally without ssh'ing to the system first using ssh remotehost unison -version I get this error returned.

ash: unison: not found

Answer 1

First check what is your path when ssh'ing to NAS:

ssh remotehost 'echo $PATH'

Then on the NAS check where is unison installed:

which unison

Most probably it will not be in the ssh path.

Solutions

If the above described was the problem you can one of the following:

1. Specify full path: ssh remotehost /full/path/unison

2. Extend path: ssh remotehost 'PATH="$PATH:/full/path" ; unison'

3. Set the path in ssh if PermitUserEnvironment is enabled in sshd configuration. Add the PATH to: ~/.ssh/environment

4. Execute the command inside a login shell on the NAS: ssh remotehost 'ash -l -c "unison"'